--- Virgil Dupras <email@example.com>
> How to you handle the tests? Copy over the tests you I recently had an example where class A used class B,
> had for foo() and
> apply them to bar()? I don't like copy and pasting
> code. Move the B
> related tests to baz()'s tests? Then your tests
> wouldn't fail if you
> stopped calling baz() in foo() and bar().
which used class C, which used class D, which used OS
service E, etc. I had mock versions of B, C, D, and
E. The overall design of the module was kind of like
a network stack, where each module theoretically only
depended on the services of the module beneath it in
So many of the tests for A used a real B, but a mock
Many of the tests for B used a real C, but a mock D.
Many of the tests for C used a real D, but a mock E.
But I also wanted to test that my abstractions weren't
leaky, e.g. that there weren't some implementation
details of C or lower that broke A. So certain loops
in my test for A would also plug in a real C.
Finally, some of the test for A would also use a mock
I was able to mostly avoid copy-and-pasting of tests
by taking advantage of Python's dynamic nature.
Although this is oversimplifying things a bit, you can
do things like this:
for b_is_mocked, c_is_mocked, d_is_mocked in [
(True, True, True),
(True, True, False),
(False, False, False), # etc.
# do setup
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